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Engineering Artificial Factors to Specifically Manipulate Alternative Splicing in Human Cells
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Tipping the balance of cell death: alternative splicing as a source of MCL-1S in cancer

Mariusz L Hartman1

  • 1Department of Molecular Biology of Cancer, Medical University of Lodz, 6/8 Mazowiecka Street, 92-215, Lodz, Poland. mariusz.hartman@umed.lodz.pl.

Cell Death & Disease
|December 18, 2024
PubMed

Insights

Overexpressing the short isoform of myeloid cell leukemia-1 (MCL-1S) shows therapeutic potential in cancer by shifting the balance from the pro-survival MCL-1L. Targeting MCL-1S may overcome drug resistance and impact mitochondrial function.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Biochemistry

Background:

  • The B-cell lymphoma-2 (BCL-2) family proteins regulate apoptosis and are key targets in anti-cancer therapies.
  • Myeloid cell leukemia-1 (MCL-1), particularly the long isoform (MCL-1L), is overexpressed in many cancers, promoting cell survival.
  • Alternative splicing of MCL1 pre-mRNA produces a short isoform, MCL-1S, which functions as a pro-apoptotic protein.

Purpose of the Study:

  • To review the structure and function of the MCL-1S isoform.
  • To discuss MCL-1S-targeting therapeutic strategies for cancer treatment.
  • To explore the role of MCL-1S in overcoming drug resistance and its impact on mitochondrial physiology.

Main Methods:

  • Literature review of studies on MCL-1 isoforms, alternative splicing, and cancer therapy.
  • Analysis of the functional differences between MCL-1L and MCL-1S.
  • Examination of therapeutic strategies targeting MCL-1S and their mechanisms.

Main Results:

  • Cancer cells typically exhibit a high MCL-1L to MCL-1S ratio, favoring survival.
  • Overexpression of MCL-1S presents a potential therapeutic approach to induce cancer cell death and overcome resistance.
  • Modulating the MCL-1L:MCL-1S balance can be achieved through splicing inhibitors or direct pre-mRNA interference.

Conclusions:

  • MCL-1S isoform represents a promising therapeutic target in oncology.
  • Strategies to increase MCL-1S levels could offer novel treatments for various cancers.
  • Further research is needed to elucidate the mechanisms by which MCL-1S affects mitochondrial function and to optimize MCL-1S-targeting therapies.

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